The former One Direction star, 25, announced his break-up from Gigi, 22, last night, tweeting: "Gigi and I had an incredibly meaningful, loving and fun relationship and I have a huge amount of respect and adoration for Gigi as a woman and a friend.

"She has such an incredible soul. I'm grateful to all of our fans for respecting this difficult decision and our privacy at this time, we wish this news could have come from us first. We love you all."

It's unclear who decided to end the relationship (Image: GC Images)

He promptly unfollowed both his ex and her mum Yolanda Hadid on Instagram, sparking speculation the split was not quite as smooth as presented.

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And Gigi may already be glad to be apart from Zayn, given that he was spotted blowing his nose in the most disgusting way possible this week.

The singer was seen in Miami without a top on, giving a clear view of the tattoo on his torso said to be of Gigi's eyes.

Zayn was seen looking skinny in Miami (Image: Splash News)

He looked thinner than usual and was smoking outside in the warm Florida sun with a troubled expression on his face.

Leaning forward, he bent over as if to look at something - then put one finger over his nostril and snorted out a load of snot.

Lovely.

He blew his nose in the grossest way (Image: Splash News)

Zayn is thought to have holed himself up in his Miami mansion since his two-year relationship came to an end two weeks ago.

The Pillowtalk singer has kept himself to himself recently, although he's been posting plenty of selfies to his Instagram over the last few days.

Gigi, meanwhile, still has pictures and videos of their time together up on her social media, including the gushing tribute she wrote to him on his 25th birthday.

On January 12 she shared a Boomerang video of him grabbing her face and pulling her in for a kiss, along with snaps of them hanging out with her horse and dog.

Gigi had paid tribute to her boyfriend just two months ago (Image: Instagram/gigihadid)

She captioned the collection: "Love this man more than I could ever put into words, & am inspired by his drive to be and do better everyday.

"Cheers to YOUR YEAR my @zayn - happiest happiest birthday & 25th year of life !! I’m proud to be by your side x."

Just eight weeks later, the pair have broken up.

Gigi's mum Yolanda - who Zayn has also stopped following on Instagram - shared a cryptic message that seems to be about her daughter's relationship woes.

Yolanda has shared a cryptic message on Instagram following the demise of Gigi and Zayn's relationship (Image: yolanda.hadid/Instagram)

"The only way that we can live, is if we grow," the quote - penned by author C Joybell C - reads.

"The only was that we can grow is if we change.

"The only way that we can change is if we learn. The only way we can learn is if we are exposed. And the only way that we can become exposed is if we throw ourselves out into the open."

Fans are convinced Yolanda is referring to Zayn with the post - although Gigi has maintained a dignified silence since tweeting her followers: "I'm forever grateful for the love, time, and life lessons that Z and I shared.

"I want nothing but the best for him and will continue to support him as a friend that I have immense respect and love for," she added.